On the 104 block, there are oil ports that dead end at the head gasket, meaning there aren't matching ports on the head. The head gasket does not have holes at these locations but actually terminate the oil port from the block.

Has anyone come across a modification to the block where you tap. locktight and plug these ports on the block? The theory is that at high revs, around 60 PSI, with a deteriating, receding head gasket, the pressure can cause the external oil leak on this engine. Knowing that the common leaks on this engine occur in the right front and rear left of the engine, these oil ports happen to reside in these areas.

Also, for reference, how much have you paid for a head gasket replacement on a 104?

best regards,

g_daddy